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EP0013355A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Process for making spun nonwoven sheets

Assignee: Patheon Austria GmbH and Co KG
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Filing: 1979-12-07
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Granted: —
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Expires: 1999-12-07
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Abstract

Abstract Translated from German Bei Spinnvliesen aus thermoplastischen Kunststoffen, die in einer Richtung eine höhere Reißfestigkeit besitzen als in der senkrecht dazu stehenden Richtung, werden die Reißfestigkeiten einander angenähert, indem man diese Vliese, in denen die Fäden in annähernder Wirrlage liegen und die durch Vernadeln verfestigt sind, bei 85 - 25°C unterhalb des Kristallitschmelzpunktes liegenden Temperaturen in der Richtung der geringeren Reißfestigkeit um 20 - 200 % der ursprünglichen Länge verstreckt, wobei in der dazu senkrechten Richtung die Länge entweder beibehalten oder im Bereich von ± 10 % verändert wird. In the case of spunbonded nonwovens made of thermoplastic materials, which have a higher tear strength in one direction than in the direction perpendicular to them, the tensile strengths are approximated to one another by making these nonwovens, in which the threads are approximately tangled and which are consolidated by needling, at 85 - 25 ° C below the crystallite melting point, temperatures in the direction of lower tensile strength are stretched by 20-200% of the original length, the length in the direction perpendicular thereto either being maintained or changed in the range of ± 10%.

Inventors

  • 👤 Heinrich Dipl.-Chem. Schneider
  • 👤 Johann Hammerschmidt

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-03 21:40
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/10; D04H3/105; D04H3/005; D04H3/007; D04H3/16

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References Cited (Backward Citations)

US3772417A Cited

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